<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>基本语法</title>
</head>

<body>
    <div id="app">
        <h1 v-if="type==='A'">A</h1>
        <h1 v-else-if="type==='B'">B</h1>
        <h1 v-else-if="type==='C'">C</h1>
        <h1 v-else>D</h1>
    </div>

    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
    <script>
        var vm = new Vue({
            el: "#app",
            data: {
                type: 'A'
            }
        });
    </script>
</body>

</html>